According to a lengthy, and growing, thread on MacRumors Forums, an unknown portion of people who have updated their iPhone, iPod touch and iPad devices to iOS 9 are now complaining about sluggish performance and unexpected crashes.

Some folks are even going as far as to suggest that iOS 9 is laggier than iOS 8.

Unfortunately, I’m one of them as well.

After upgrading my iPhone 6 Plus and iPad Air to iOS 9 I couldn’t help but notice overall sluggishness and considerable lag on both my devices, especially when I’m using the new task switcher or bringing up Spotlight Search.

“iOS 9 is noticeably slower than iOS 8 and I’m not happy,” says a comment.

It’s not just that people on older hardware like the iPhone 5 or iPad 3 are reporting lagginess. “It still has some noticeable lag on my iPhone 6,” a poster complained.

“I’m not sure whats going on but iPad Air 2 is struggling,” another one said. “Everything takes ages, it’s very laggy.”

“iPhone is settled down but then the weird animation stutters randomly creep in, apps launch slower,” a disgruntled user complained.

“I honestly cannot stomach this sort of regression in a one year old phone. I’m scrambling to get back to iOS 8 and hope my back up is going to work.”

Contrast these reports with other fans who swear that their devices are faster, more reliable and less crash-prone after updating to iOS 9 so your mileage may, and definitely will vary.

“100 percent completely opposite for me,” another one writes. “My iPhone 6 and iPad Air 2 are running fantastically. Much better then iOS 7 and 8.”

“I have the iPhone 6 and it is as smooth as anything,” yet another dude said.

Issues like these are the norm for major iOS releases.

Typical remedies involve performing a clean install rather than upgrading from an earlier iOS version and resetting your device rather than restoring from a backup.

I’m going to try a fresh install of iOS 9 on my devices and hopefully it will be less laggy on my iPhone 6 Plus than it is now. Beta testers are saying that the forthcoming iOS 9.1 software update improves the performance considerably so you have something to look forward to.

Keep in mind that Spotlight runs the indexing process after booting into iOS 9 for the first time, which can take anywhere from a few minutes to a few hours, so there’s that too.

How’s iOS 9 for you?

Are your iOS gadget more responsive and less buggy after upgrading? And are iOS releases made with planned obsolesce in mind, do you think?